Geothermal heat- to provide energy for process like subduction, melting and metamorphism (to drive plate tectonics)
solar energy- for processes like erosion, weathering and transport
Contour lines on a map indicate elevation, or depth. Numeric notations on contour lines refer to the level of elevation, or height about sea level.
A theory is a system of rules and principles that can be applied to a wide variety of circumstances and has been successfully tested, but that is not universally accepted.
The intent of THEORY is a reasonable or scientifically satisfactory known principle or body of principles proposed to explain phenomena. The word often denotes an untested hunch or a guess without backing proof. But for scientists, a theory has closely the opposite meaning. A theory is a well-substantiated description of a facet of the real world that can incorporate rules, hypotheses, and facts.
The theory is a belief to clarify something, or a set of directing principles. Einstein's views about relativity are an example of the theory of relativity.
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The lines going up and down are longitude and the lines going from side to side are latitude.
